I added and removed point (6) "'ShenmemingdeZhou numerals" a couple of times
before sending the mail. I also considered a couple of other numeric systems
that Chinese have in their character sets, and do use in some circumstances
(Roman numerals, parenthesized or circled numbers, sup/sub digits, etc.).

But Samir's question was about what kind of numeric representation(s) his
application must be able to *accept* and *generate*, and I thought that no
Chinese user would expect a computer to understand or present him/her
Hangzhou (or Roman) numerals. Was this a poor assumption?

(In case someone wonders: I included points (4) and (5) because my
colleagues and I had to implement them for an actual Chinese customer).